Boat.



W. B. MOTHER-AL.

BOAT.

' APPLICATION H LBD 1336.24, 1901. BBNEWED FEB. 25, 1908.

Patented Got. 6, 908.

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WILLIAM B. MOTHERAL, or NORTH MCGREGOR, Iowa, AssIeNoR To GLIDING BoarCOMPANY OF AMERICA, VOF NEW YORK, N. Y.

, A OORPORATION OF NEv YORK. v

BOAT.'

Specification of Letters Patent.

resented ocr;l 6,1908.

Application filed December 24, 1901, Serial No. 87,065. Renewed February25, 1908..A Serial No. 4-17,"v703.`

.boats of 4that general character shown in my Patent N o. 6904029 ofDecember 31,1901, whereby greater'eiiciency is secured and the cost ofconstruction and operation reduced. as will be' hereinafter. more fullydescribed and claimed.

Referring to the accompanying drawings. which are made a part hereof:land sI-Imlar reference characters indicate similar parts, Figure 1 is anunderside plan view ot' a boat embodying my said invention. Fig. 2 acentral longitudinal section through the same, on the dotted line 2-v-2in Fig. l, Fig. 3 1s a transverse sect-ion on the dotted line 3.43. Fig.4t is a transverse section On'the dotted line 4 4, and Figs. 5 and 6Aare detail sec'- tions showing more clearly the ytorni and re1- ativeposition of the air tubes .to the bottom.

In said drawings the portions marked- A 'lepesentthe sides and B thebottom ofthe The construction of said hull is of any appropriate designor plan, except as to its exterior, which is wedge-shaped with anthestern itis flattened more abruptly, forming downwardly bulged or curveside por'- tions,l a at this point, but maintaining an ever keel orcenter, as shown. By this means the stern is given a tendency to riseupon the water as the speed ot' the boat increases,

and thus prevents the bow from rising up out of the water, and alsoreduces the frictional contact of the'boat with the water, as

Vwell as its displacement, which results in great .speed being madepossible with comy paratively little power. By the term even keel I meanthe central portion of the bottom of the boat, as on the dotted line 2-2on which in F l, which is straightior eveniasfshoiwn clearly vin Fig.'2.

I have shown a system .of pipes` forsupplying air to the bottom ottheboatavhich of peculiar advantage. The short sections l. arepreferably formed of rubber or flexible material and project throughthe'bottom slightly, as shown in Fig. 5. so that a portion of their diameterwill bear upon the surface of the water below the bottom of the boat. By forming said tubes of flexible material they will give to the pressureof the water and thus otter less resistance than if lnadeof rigid niaterial. These sections arel arranged in several rows extendinglongitudinally of the boat and are each connected to 'longitudinalchambers or pipes 2, which in turn are connected by a cross pipe 3, andsaid cross pipe is connected to a vertical pipe L which leads to the airwhen open. A

valve V is provided in this pipe for closing lthe same when desired. sothat the supply ot' air :may be rut otll when it is desired to increasethe friotional contact with the water, aswhen the boatis to be stopped,and alsoto preventthe water from backing into the boat.. A lever Llocated convenient to the engineer or pilot is connected tothe stem4 ofvalve V b'y a rod It, whereby said valve may be operated by the onecontrolling the boat; In use, the valve V is normallyclosed, and thepipes 1, 2, 3, and 4, are of course, filled with water when the boat isat rest. After started in mot-ion the `valve is opened and-the action ofthe water in passing' over the ends of tubes l draws the water from saidpipes and air down through them 'to beneath the boat. serving tolubricate the ,bottom and enable greater speed to be secured with thepower.

An engine E and boiler E are shown as the means for supplying motivepower to drive theboat. y

Having thus fully described my said invention, whatI claim as new anddesire to secure by Letters Patent, is

l. A boat formed with a bottom curved in cross section, the curvaturegradually decreasing I'irom bow to stern.

'2. A boat having a wedge shaped hull with a bottom curved in crosssection, the greatest curvature being near the bow, and the least nearthe stern. i 3. A wedge shaped boat with a bottoms.

hte air supply pipes projecting through its curved in cross section,with 'nn eren keel .but n bulged down portion on @sich side naar thestern.

4. A. boat formed with Wedge 'shnpndi hull having L bottoni' curved inCross section the radius of the curvature increasing from bow to stern,with an abrupt decrease in curvature at L point nem. the ern.

5. A. boat formed Wedge-Shaped with n bottom curved in cross section,having {texibottom connected to :i system of pipes sur ptied from anoutwardly extending supply plpe.

sooeo G. A Wedge shaped bont'. with bottoni curved in cross `ention`rthe curvziture gradu- :itty decreasing troni how to stern,\vith-performed bottoni connected to :in nir supply system.

Tn Witness whereof, ,T have heivunto not my hand und Sent at North MCGregni', Iowa. this fourth day of December, A.. D. nineteen hundredundone.

VLLLxM B. MOTI'ERAL. YL. s.] Tf'vitnesses E. B. PLUMB, WM. QUIGLEY.

